The Franzetta cover deceives, of course. This book is mostly _not_ about a naked woman wrapped in snake gesturing at a giant in a swamp. It does have it inside, however, and if you listen carefully you can hear the author hammering away at the natural course of the story until the cover art can be justified.
It has that feel to it: Jakes is churning out story at a high pace in his "Brak the Barbarian" style and never went back to deal with the rough edges. He--Gavin Black, in narration--takes about thirty pages to shovel backstory and recap the previous book and then get it going in some kind of direction. During this part, as Gavin loses his writing contract due to alcohol and deals with depressing personal problems, the reader can only flip between this and the cover, trying to see how the two things could possibly connect.
The result lacks a skeleton and is little more than Gavin et al being thrown into situation after situation until returning to the depressing status quo. It almost achieved something by the climax, as he and his cohorts fabricate a second Witch of the South using an ill-trained adept, in order to break a city invasion and get close to the villain of the piece. And then get embroiled again in the dysfunctional city politics as a poor substitute for a god-king.
But then the story slams shut, with an unsatisfying ending that implied but never delivered a trilogy.